| 摘要 |
1,219,466. Extracting fats. E. LEVIN. 23 May, 1968 [23 May, 1967], No. 24756/68. Heading C5C. A process of removing fat and water from biological material, e.g. fish, meat or coconut, to produce a nutritious solid residue comprises providing within a distillation vessel an azeotrope-forming zone containing a fat solvent which forms with water an azeotrope having a b.p. materially lower than the b.p. of the solvent, introducing comminuted biological material into the solvent to form a slurry, heating solvent to form hot solvent vapour and introducing the vapour below the surface of the slurry which is kept at a temperature well below the condensing temperature of solvent by evaporation from the slurry of the low boiling azeotrope, boiling off the azeotrope using the heat of condensation of the solvent vapour collecting and condensing the azeotrope and recovering from the azeotropeforming zone a defatted and dehydrated solid residue. Preferred non-polar solvents are pentane, hexane, heptane, benzene, toluene and cyclohexane. Polar solvents which may be used as ethylene dichloride, propylene dichloride and perchlorethylene.
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